Shelf



FIG. 1 is a front top left perspective of a shelf of the present invention;

FIG. 2 is a first plan view of the shelf of FIG. 1;

FIG. 3 is a second plan view of the shelf of FIG. 1;

FIG. 4 is a first side elevation view of the shelf of FIG. 1;

FIG. 5 is a second side elevation view of the shelf of FIG. 1;

FIG. 6 is a first end view of the shelf of FIG. 1; and,

FIG. 7 is a second end view of the shelf of FIG. 1. 

CLAIM The ornamental design for a shelf, as shown and described. 